图 (a) 说明了 V20 焊接金属的纳米级 MC 碳化物，并用紫红色标记的 5 at% (C + V) 水平等浓度表面描绘。在图（b）中进一步研究了图（a）中纳米级 MC 碳化物的代表性示例，由红色虚线圆圈表示，其中显示了纳米级 MC 碳化物的邻近直方图浓度分布。根据图中正距离侧的几个点，该析出物中近中心区域富集的 C、V 和 Mo， 预计为富 V 和富 Mo 碳化物。该碳化物中约 50 at% 的 C 浓度与 (V + Mo) 几乎相同，表明该碳化物的化学成分更接近于 V0.5Mo0.5C。

Fig (a) illustrates the nanoscale MC carbides of the V20 weld metal, derived from the APT analysis and delineated with a 5 at% (C + V) level iso-concentration surface marked in purplish-red. The representative example of the nanoscale MC carbides from Fig (a), indicated by the dashed red circle, is further investigated in Fig (b), in which the proximity histogram concentration profiles of the nanoscale MC carbide are displayed. The enriched C, V, and Mo of the near-centre region in this precipitate, according to several points on the positive distance sides of the diagram, were anticipated to be V-rich and Mo-rich carbide. The C concentration of approximately 50 at% in this carbide was almost the same as (V + Mo), suggesting that the chemical composition of this precipitate was closer to V0.5Mo0.5C.